Convertible tapping and drilling machine.



A. w. MESICK, CONVERTIBLE TAPPING AND DRILLING MACHINE.

APPLICATION FILED JAN-12.1917.

Patented Nov; 20, 1917'.

WITNESSES: I

AfTO'RNES- FFEQEQ ALBERT W. MESICK, 0F BROOKLYN, NEW YORK.

CONVERTIBLE TAPPING AND DRILLING MACHINE.

Specification of Letters Patent.

Patented Nov. 2o, ieir'.

Application filed January 12;, 1917. Serial No. 141,922.

To all whom it may concern:

Be it known that I, ALBERT W. MnsIoK, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Convertible Tapping and Drilling Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable, others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

The present invention relates, generally, to improvements in convertible tapping and drilling machines; and the invention has reference, more particularly, to a unit machine which may be operated as a sensitive tapping machine, and by a simple manipulation of certain elements quickly converted to be operated as a direct and positively driven drilling machine.

The invention has for its principal object to provide a simple, cheap and novel construction of machine, the spindle of which may be driven through friction transmission mechanism in opposite directions, the latter being adapted to rotate the spindle at one speed in one direction, and at a higher speed in the opposite direction, thus rendering the operation of the same suitable to a sensitive tapping machine; and there is also provided an easily manipulated positive looking or coupling means for positively locking the friction transmission mechanism to the high speed pulley so that the spindle is directly and positively driven at a proper speed for drilling operations, as distinguished from ta'pping operations, thus rendering the machine easily and quickly convertible to the performance of either the tapping operation or the drilling operation at will. I

Other objects 'of the present invention, not at this time more particularly enumerated will be clearly understood from the following detailed description of "the same.

With the various objects of the present invention in view, the same consists, primarily, in the novel convertible tapping and drilling machine hereinafter set forth; and, the invention consists, furthermore, in the various arrangements and combinations of the several devices and parts, as well as in the details of the construction of the same, all of which will be more fully described in the following specification, and then finally embodied in the claims which are appended thereto. I

' The invention is clearly illustrated in the accompanying drawings, in which Figure 1 is a side elevation of the novel convertible tapping and drilling machine,

made according to and embodying the princrples of my present invention. 1

Fig. 2 is an enlarged 'detall vertical longitudinal section through the spindle transmission mechanism, illustrating one form of the novel looking or coupling devices which, when properly manipulated convert the machine from asensitive tapping machine to a positively driven drilling machine.

Fig. 3 is a detail horizontal section taken on line33 in said Fig. 2, looking down is built in the horizontal style. Connected with the upper end of said standard 2 are forwardly projecting supporting arms 3 and 4, the same being suitably spaced one above the other, as shown. The free end of each arm is provided with a vertical bearing portion 5. Journaled in said bearing portions 5 is a vertical spindle 6 running in the bushings 7. Fixed on said spindle 6, so as to be rotated thereby, is a friction disk clutch 8, provided on opposite sides, around the marginal area thereof, with friction gripping members 9, preferably constructed of leather, composition, rubber or other suitable material.

Rotatably mounted on the bushing 70f said spindle 6, above said friction disk clutch 8, is a slow speed pulley 10, provided on its under surface with an annular shoulder 11, the surface of which is opposed to and operatively receives the engagement of the upper friction gripping member 9 of said friction disk clutch 8. Formed in the underside of said slow speed pulley 10,

within saidzshoulder 1 1, is an annular space to said standard :2 is a or channel 12. The web 13 of said pulley 10, above said annular space or channel 1:2, is provided with diametrically opposite openings or hatches 11- giving access to the interior of said annular space or channel 153 Rota-tably mounted on the bushing '7 of said spindle 6, below said friction disk clutch 8, is a high speed pulley 15, provided on its upper marginal edge with an annular flange 16, the surface of which is opposed to and operatively receives the-engagement of the lower friction gripping member 9 of said friction disk clutch 8.

Secured upon the lower end of. saic spin dle 6 is any desirable form or construction of chuck 17, adapted to operatively couple with the spindle a tap 18, or a drill (not shown), according to the desired use of the machine.

Connected with said vertical standard 2 is a rearwardly extending arm 19, in the free end of which is rotatably mounted a transverse jack-shaft 20, upon which are fixed a pair of pulleys 21, one on each side of said arm 19,

The reference character 22 indicates an endless belt which passes around said slow speed pulley 10, thence around said pulleys 21, and thence around said high speed pulley 15, thereby transmitting the rotary move ment of said jack-shaft 20 to said respective pulleys 10 and 15, and by reason of the arrangement described, driving the pulley 10 in one direction and the pulley 15 in the op posite direction.

Fixed on said jack-shaft 20 is a driving pulley 23, over which runs the driving belt 24, which is driven from any suitable source of power.

The reference character 25 indicates a work-supporting table mounted beneath the spindle 6. Formed in said base 1 is a guideportion 26, in which is slidably mounted a vertical shaft or shank 27, upon the upper end of which is fixed said table 25. Pivoted lever-member 28, having a bifurcated end 29 adapted to be pivoted to said shaft or shank 27. ll hen the machine is mounted on a work-bench 30, the free end of said lever-member 28 is coupled with a foot-lever (not shown) beneath said bench by means of a connecting rod 32, which passes through the openings 31 in base and bench, so that when the connecting-rod is pulled downward, the levermember 28 is oscillated to move upward said table toward the tap or drill, and

thus is caused to carry the work, supported openings 33, so as to screw up and down therein, are the screw-threaded shanks 3 1, the upper ends of said shanks 3% having the usual slotted heads 36 for manipulating the same. Formed in the upper surface of said high speed pulley 15, so as to be capable of being registered in alinement with said screw-threaded openings 33 and the shanks 34 therein are diametrically opposite screwthreaded receiving-openings 37, which receive the lower ends 35 of said shanks 34-, when the same are screwed down, thus serving to positively couple or lock said friction disk clutch 8 with said high speed pulley 15. It will be understood that the coupling devices, constructed as above described, may be subject to many mechanical variations, hence, 1 do not limit myself to the said construction, since the same is merely illustrative, and l conceive and claim my invention to be broad enough in scope to include means generally which serve to lock or couple at will, said friction disk clutch 8 positively with the pulley 15, for the purposes herein disclosed.

VJ hen it is desired to use the machine as a tapping machine, the screw -threaded shanks as are turned up in said threaded openings 33 to withdraw said lower ends 35 from the receivingopenings 37 of the pulley 15, thus allowing the latter to rotate freely and independently of the friction disk clutch 8. The tap 18 being secured in the chuck 17, and the work placed on the table 25 beneath the same, the machine is ready for operation. The lever-member 28 is operated to raise this table 25, which carries the work into operative contact with the tap 18, and by the upward pressure applied to the table the work is fed to the tap. As soon as the work contacts with the tap 18, it exerts an upward pressure thereon which tends to push upward the spindle 6, thereby forcing the friction disk clutch 8 upwardly so that its upper friction gripping member 9 is carried into frictional clutching engagement with the shoulder 11 of the pulley 10, the latter of course being rotated by the endless belt 22, consequently its rotation is transmitted through said friction disk clutch 8 to the spindle 6, thus driving the tap, in the working direction, into the work. The tapping operation being completed, the table 25 is allowed to drop down to normal position, the downward movement thereof permitting the work to drag downwardly upon the tap. Such drag causes the spindle 6 to move downward, and therefore carries the friction disk clutch 8 away from operative engagement with the shoulder 11 of the pulley 10, and moves its lower friction gripping-member 9 into operative engagement with the flange 16 of the high speed pulley 15, thus imparting to the spindle 6 a rotary movement at higher speed in the opposite direction, which rotates the tap 18 in the withdrawing direction, and results in its removal from the work. Since the motion imparted to the spindle and tap in either direction is transmitted through the,

frictional engagement of the friction disk clutch 8 with either one or the other of the continuously rotating pulleys, 10 or 15, it will be understood that the movement of the tap 18 relative to the work is easily sensitive to any obstructing cause, and if the movement of the tap 18 is obstructed or resisted, the frictional engagement of the friction disk clutch 8 with either pulley 10 or 15 will yield thereto, by slipping, thus avoiding any danger of breaking or injuring the tap.

When it is desired to use the machine as a drilling machine, the pulley 10 is turned until two of its openings or hatches 14 are registered above or over the slotted heads 36 of the shanks 34 carried in said friction disk clutch 8. Then by inserting a screwdriver through said openings or hatches 14, the slotted heads 36 may be engaged and 1; turned, thereby turning downward said shanks 34 in said openings 33 to screw the lower ends 35 thereof into the receivingopenings 37 of said high speed pulley 15, and consequently, to thereby positively lock or couple said pulley 15 with said disk clutch 8 and spindle 6, to positively and directly drive the latter. Since the high speed pulley 15 rotates in the opposite direction to the proper or required drilling direction when the machine is used forvtapping, be-

cause the withdrawing movement of the tap and spindle is governed by said pulley under such conditions, it is necessary to cross the driving belt 24 operating the driving pulley 23, thus reversing the direction of rotation of said pulley 15, as will be understood and thereby permitting the same to transmit a proper motion to the spindle, and drill aflixed in the chuck 17 thereof. Of

" course, in withdrawing the drill from the work its direction of rotation need and in fact should not be changed, as is done in the case of tapping operations, consequently the direct drive established between the spindle 6 and pulley 15 fulfils all the conditions v requisite to the drilling operations. It will thus be apparent that by the simple manipulat on's above described, the machine is easily and quickly converted from a sensitive tapplng machine to a positive and direct drilling machine wherein all the power is available for the drilling operation.

I am aware that some changes may be made in the general arrangements and combinations of the devices and parts, as well as in the details of the construction of the same, without departing from the scope of my present invention as defined in the claims appended hereto. Hence, I do not limit my invention to the exact arrangements and combinations of the various devices and parts as set forth in the foregoing specification, nor do I confint myself to the exact details of the construction of said parts as illustrated in the accompanying drawings.

I claim 1. In a convertible tapping and drilling machine the combination with the chuck spindle thereof of a friction disk clutch fixed thereon, pulleys mounted to rotate freely on said spindle respectively above and beneath said disk clutch, said pulleys each having portions adapted to be frictionally engaged by said disk clutch, movable locking means carried by said disk clutch, and means connected with one of said pulleys adapted to receive said locking means to interlock the same with said'disk clutch.

2. In a convertible tapping and drilling machine the combination with the chuck spindle thereof of a friction disk clutch fixed on said spindle, a slow speed pulley mounted to rotate freely on said spindle above said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch, a high speed pulley mounted to rotate freely on said spindle below said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch, movable locking means carried by said disk clutch, and means connected with said high speed pulley adapted to receive the interlocking engagement of said locking means, said slow speed pulley having openings in its web giving access to said locking means to permit the manipulation thereof.

3. In a convertible tapping and drilling machine the combination with the chuck spindle thereof of a friction disk clutch fixed on said spindle, a slow speed pulley mounted to rotate freely on said spindle above said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch, a high speed pulley mounted to rotate freely on said spindle below said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch, said slow speed pulley having an annular channel or chamber in its under side, vertically movable coupling means supported in connection with said disk clutch, said means extending upwardly into said annular channel or chamber of said slow speed pulley, said slow speed pulley having openings in its .web giving access to said coupling means to permit manipulation thereof, and said high speed pulley having receiving-openings adapted to receive said coupling-means when the same are manipulated to positively couple said disk-clutch with said high speed pulley, for the purposes described.

4. In a convertible tapping and drilling machine the combination with the chuck spindle thereof of a friction disk clutch fixed on said spindle, a slow speed pulley mounted to rotate freely on said spindle above said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch, a high speed pulley mounted to rotate freely on said spindle below said disk clutch and having a portion adapted to be frictionally engaged by said disk clutch said slow speed pulley having an annular channel or chamber in its under side, said disk clutch having screw-threaded openings in its body, screw-threaded shanks extending downwardly in screwing engagement With said screw threaded openings of said disk clutch, slotted heads on the upper ends of said shanks extending into said annular channel or chamber of said slow speed pul- 7 ley, said sloW speed pulley having openings in its Web giving access to said slotted heads of said shanks, and said high speed pulley having screw-threaded receiving openings adapted to receive the lower ends of said shanks to positively interlock said disk clutch With said high speed pulley, for the purposes specified.

In testimony, that I claim the invention set forth above I have hereunto set my hand this 8th day of January, 1917.

ALBERT W. MESICK.

Witnesses:

MARION M. BARITA, GEORGE D. RICHARDS.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. @J" 

